Low-nitrogen combustion device for enhancing pulverized coal gasification

Abstract

The invention discloses a low-nitrogen combustion device for enhancing pulverized coal gasification and relates to the field of pulverized coal gasification. According to the device, a thick pulverized coal burner and a thin pulverized coal burner are additionally arranged on a boiler hearth, the thick pulverized coal burner comprises a thick pulverized coal primary air channel, a thick pulverizedcoal steam channel and a thick pulverized coal secondary air annular channel, and the thin pulverized coal burner comprises a thin pulverized coal primary air channel, a thin pulverized coal steam annular channel and a thin pulverized coal secondary air channel. Primary air composed of hot air, high-temperature flue gas and low-temperature flue gas carries pulverized coal to enter the hearth, thepulverized coal, water vapor in the steam channel and CO2 in the flue gas are subjected to a violent gasification reaction, a very strong reducing atmosphere is formed, and then generation of NOx isreduced. And unburnt substances are mixed with the hot air in the secondary air channel for combustion. According to the device, more reducing components are formed by strengthening gasification of the pulverized coal such that the emission of the NOx is reduced, and the device has obvious environmental benefits.

Description

technical field [0001] The invention relates to the field of pulverized coal gasification, in particular to a low-nitrogen combustion device for enhancing pulverized coal gasification. Background technique [0002] my country's pollutant discharge standards are becoming increasingly stringent. In order to ensure compliance with the discharge standards, it is urgent to adopt more effective treatment processes. At present, the main NOx control technologies include SCR, SNCR and low-nitrogen combustion technologies. The low-nitrogen combustion methods include air staged combustion technology, fuel re-combustion technology, flue gas recirculation combustion technology, etc. Air staged combustion technology is one of the most common low-nitrogen combustion technologies at present. It reduces the air in the main combustion zone to 70%-75% of the total air volume, and makes the fuel burn in an oxygen-deficient state, which not only delays the combustion rate and degree , and the ...

AI Technical Summary

Problems solved by technology

The low-nitrogen combustion method is based on coal forming a reducing atmosphere under anoxic conditions, thereby realizing the removal of NOx. However, the reduction formed in the above method is weak, and the NOx removal rate is low.

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